The tutorial of the Standardization Association (Afnor), attached to the Ministry of Industry.
Advantage: it is a “pleated” fabric mask that covers the nose, mouth and chin.
Disadvantage: you have to follow a specific pattern and have some notions of sewing, which can discourage more than one.
Please note, this mask complies with the new recommendations (“Better an artisan mask than nothing at all”) but it is in no way a guarantee of non-contamination. Only confinement and respect for barrier gestures effectively protect you.
See as well :
>>> How to easily make a paper mask
>>> A fabric mask achievable in less than two minutes, and seamless